The trick is to find a page that isn’t cached - there are various ways to do that, but anything that a lot of people try is likely to fail after a while as it gets cached.
In Firefox, refreshing the page and clearing cache did not correct the problem - In Chrome the new items seem to show properly without any refresh. I only discovered this today, and this has been driving me crazy all week.
As a web developer for 15 years myself, I can only say that this is the WORST “professional” coding job that I have ever seen. I would flunk a High School student for delivering code this bad. And please spare me the “you don’t know how difficult this is” lecture. I know exactly how difficult some things are and how easy most of it is.